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Change undercurl escape code to 4:x

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See https://github.com/neovim/neovim/issues/7479
for discussion. Also implement double underline.
This commit is contained in:
Kovid Goyal
2017-12-04 12:26:50 +05:30
parent 27cd303a05
commit e81ba3b207
5 changed files with 26 additions and 19 deletions
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10
protocol-extensions.asciidoc
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@@ -28,11 +28,15 @@ in terminal editors such as vim and emacs to display red, wavy underlines under
mis-spelled words and/or syntax errors. This is done by re-purposing some SGR escape codes
that are not used in modern terminals (https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_codes)
To change the underline style from straight line to curl (this used to be the
code for rapid blinking text, only previous use I know of was in MS-DOS ANSI.sys):
To set the underline style:
```
<ESC>[6m
<ESC>[4:0m # this is no underline
<ESC>[4:1m # this is a straight underline
<ESC>[4:2m # this is a double underline
<ESC>[4:3m # this is a curly underline
<ESC>[4m # this is a straight underline (for backwards compat)
<ESC>[24m # this is no underline (for backwards compat)
```
To set the underline color (this is reserved and as far as I can tell not actually used for anything):